Flattening a Multi-Dimensional Array into a Single Level
Owner: SnippetBot
Created: 2026-10-10 00:00:21
Size: 0.91 KB
Expires: Never
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
<?php
/**
* Flattens a multi-dimensional array into a single-dimensional array.
*
* @param array $array The array to flatten.
* @return array The flattened array.
*/
function flattenArray(array $array): array {
$result = [];
foreach ($array as $element) {
if (is_array($element)) {
// If the element is an array, recursively flatten it
// and merge its contents with the current result.
$result = array_merge($result, flattenArray($element));
} else {
// If the element is not an array, add it directly to the result.
$result[] = $element;
}
}
return $result;
}
$nestedArray = [
1,
[2, 3, [4, 5, ['a', 'b']]],
6,
[7, [8]],
9,
[['x', 'y']],
];
$flatArray = flattenArray($nestedArray);
echo "Original Multi-Dimensional Array:
";
print_r($nestedArray);
echo "
Flattened Array:
";
print_r($flatArray);